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identity=mailfrom; envelope-from="steve@quintile.net"; helo=mx2.mythic-beasts.com; client-ip=46.235.227.24 Received: from mx2.mythic-beasts.com (mx2.mythic-beasts.com [46.235.227.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tb-mx1.topicbox.com (Postfix) with ESMTPS for <9fans@9fans.net>; Fri, 1 Mar 2024 05:37:37 -0500 (EST) (envelope-from steve@quintile.net) Received: by mailhub-hex-d.mythic-beasts.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1rg0Gm-00AOWs-9X for 9fans@9fans.net; Fri, 01 Mar 2024 10:37:36 +0000 From: Steve simon Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.700.6\)) Subject: Re: [9fans] dd(1) takes very long Date: Fri, 1 Mar 2024 10:37:24 +0000 References: <6141BAD3-1BE6-40F5-B9BA-4BE94EAF752F@germteig.com> <20240301095358.268edad4@ikilid> <20240301103501.762d6606@ikilid> To: 9fans <9fans@9fans.net> In-Reply-To: Message-Id: <254FA221-AFDF-4D5F-9A54-C5D9DEC7E3B5@quintile.net> X-Mailer: Apple Mail (2.3731.700.6) X-BlackCat-Spam-Score: 4 Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: bc74e92e-d7b7-11ee-bb45-ae003991fe35 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UMGZkNjQ0NGFjYjljNzgxMS1NYjU4NDk3MTE0NzFiOTFmYmEyYTQx?= =?UTF-8?B?OWZmPg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:Mb5849711471b91fba2a419ff:1:5aj6mnsiAkXTQQ_HAc_gfdVQtbeGb4yADN9weO8SvJ8 A larger block size as lucio says, and also try two dd's with a pipe betwee= n them, one reading and one writing. dd(1) is single threaded but you have two asyn= chronous physical devices. I have had good success copying sd-cards using fcp - rsc's multithreaded = cp, already in the distribution, though I don't know what blocksize it uses offhand. -Steve > On 1 Mar 2024, at 09:39, Lucio De Re wrote: >=20 > Increasing the dd block size (-bs 1024k or as big as the man pages > allow) could make a big difference. >=20 >=20 > On 3/1/24, Aleksandar Kuktin wrote: >>> On Fri, 1 Mar 2024 10:08:25 +0100 >>> Marco Feichtinger wrote: >>>=20 >>>> and the computer isn't a SBC bitty box, the transfer rate is weirdly >>>> low. >>>=20 >>> Well, both disk are on the same machine. >>> It's a Supermicro X7SPA-H-D525 board. >>>=20 >>> -marco >>=20 >> Well, that's not a bitty box. Wish I bought something like that instead >> of my BananaPi. Anyway, someone more knowledgeable on Plan 9 than me is >> needed. I can only speculate that the OS and hardware fight. I have >> something similar happening on my desktop with modern hardware running >> old software. I run GNU/Linux on it. For some reason I can't figure out, >> transfers start off normal but then degrade to 10 Mbps or less after a >> few GiB are transferred. If I try it with CentOS 7, it runs fine. But >> when I use my own homegrown distro it's pathologic. Kernel version >> 3.16.85, vanilla. >>=20 >> -- >> Svi moji e-mailovi su kriptografski potpisani. Proverite ih. >> All of my e-mails are cryptographically signed. Verify them. >> -- >> You don't need an AI for a robot uprising. >> Humans will do just fine. >> -- >>=20 >=20 >=20 > -- > Lucio De Re > 2 Piet Retief St > Kestell (Eastern Free State) > 9860 South Africa >=20 > Ph.: +27 58 653 1433 > Cell: +27 83 251 5824 ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T0fd6444acb9c7811-Mb5849= 711471b91fba2a419ff Delivery options: https://9fans.topicbox.com/groups/9fans/subscription